Draftsman s pen



D. C. LEWIS.

DRAFTSMANS PEN.

APPLICATION FILED JULY 23.1918.

1,314,879. Patented Sept. 2,1919.

mrksss: 7 Jean C. Lear/Cw w m mr v,n'nirnn STATES PATENT OFFICE.

DEAN G. LEWIS, OF PHILADELPHIA, PENNSYLVANIA.

To all whom it may concern:

Be it known that I, DEAN (J. LEWIS, a

.. citizen of the United States, residing at Philadelphia, county of Philadelphia, and State of Pennsylvania, have invented a new and useful Improvement in Draftsmens Pens, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

The object of my invention is to provide a pen for mechanical draftsmen, similar to what is called a rulingpen, which is adapted, when drawn over the surface of the paper on which the drawing is being made, to form dotted or broken lines and which may be adjusted to make a plurality of distinctive types of dotted or broken lines. Thus, it is frequently necessary to make, on a single drawing, a considerable number of dotted or broken lines, which, when made with an ordinary ruling pen, require the expenditure of considerable time; and, moreover, it is practically impossible to make the dots or dashes of uniform dimensions uniformly spaced apart. It is also commonly necessary to make different forms of dottedv lines. Thus, one line may comprise a series of dashes of uniform length. Another line may comprise a series of alternating short and long dashes. It is obvious that any instrument which can be used to make such lines automatically, rapidly and with any approach toideal accuracy, will save much time and enable the draftsman to turn out more artistic work.

My invention comprises an instrument adapted to attain the objects specified, a preferred embodiment being shown in the drawings, in which- Figure 1 is a side elevation of the instrument.

Fig. 2 is an enlarged front view of the instrument with the pen omitted.

Fig. 3'is an enlargedside view of the head of the instrument.

Fig.4 is a perspective view of the pen.

Fig. 5 is a detail view of the adjusting screw for the pen.

Fig. 6 is a detail view of the cam-block for operating the pen.

Fig. 7 is aprear view of the head of the instrument.

Specification of Letters Patent.

Application filed July 23. 1918. Serial No. 246.309.

DRAFTSMANS PEN.

, Patented Sept. 2, 1919.

Fig. 8 is an enlarged side View largely in sectlon of the head of the instrument.

The holder comprises a shank (1 having a cylindrical forward or lower portion b prov1 ded with a side bracket 0, in which is slldably mounted one jaw or blade 03 of the pen proper. The other jaw or blade e of the pen is pivoted, at its upper end, to the upper end of aw cl. Preferably, the upper end of aw d is provided with ears 7 between WhlCh. extends a pin 9 on which the upper end of the jaw e is sleeved. The jaw e is wider than its sleeved end, and is slitted longitudinally, in line with opposite ends of the sleeve, forming spring fingers h which slide upon the ears f as thejaw e s opened, as shown in Fig. 4.. When the Jaw 6 1s moved toward its closed position, the fingers h act as springs to wholly close thejaw, but when the jaw e is opened beyond a certain distance, the fingers h engage the upper faces of the ears 7 in such manner as to hold the jaw e in its open position. This construction affords a ready means for cleaning the pen.

Within the cylindrical holder slides longitudinally a block 2' having, near 1ts upper end, a circumferential groove y adapted to receive the end of a pin is which is threaded into the jaw d of the pen and passes through a slot Z in bracket 0. The pin k-is virtually a thumbscrew, the head m of which is positioned between the two jaws of the pen. When the head m is turned so that it actually engages the face-of jaw d, it allows the jaw e to swing in so that its lower end nearly or quite touches the lower end. of jaw 01. By screwingit out slightly, the lower ends of i'ahBJZtWS of the pen may be spaced apart more or less. Thereby the thickness of the line to be inked by the pen may be predetermined. By removing. the pin is, the pen may be removed from the holder.

It is clear that by raising the block 2', the pen will be similarly raised. By providing mechanism to raise and lower the block at regular intervals, thefeed of ink from pen to paper will be interrupted at intervals, thereby forming a dotted or broken line. The following mechanism is provided to so actuate the block Secured to the lower end of the holder is a transversely extending stud 0 on which turns a sleeve provided with three wheels or disks, namely: "a knurled wheel p which is adapted to roll continuously, uponthe paper, and two cam .disksr and 8, one of which, 1, is provided with a number of projections and depressions uniformly spaced apart and the other of which, 8, is provided with a periphery which is plain except for two spaced-apart projections. The lower end of the block 71 is provided with a cam or projection n, which is in operative relation with one or the other of the cam disks,

dependent upon whether theblock is in the position shown in Figs. 1, 3, 7 and 8, or

whether the block is turned from this position 180 degrees on'itsaxis, as is herelnafter explained, The block a is igheld yieldlngly depressedby means ofa coil spring t within the cylindrical body 6 above the blo'ckz'.

1 Assuming the .parts to be positioned as shown 'mostcl'early, perhaps, in Fig. 8, that the pen carries a suitable quantity of 'ink,

7 I and that "the instrument is rolled over the 'pap'er,it is clear that the wheel p will rapidly 'rotate the cam disk 1 which will lift the blotikc sh'or'tbut regular intervals,the spring "t returning the block immediately after the projection n overrides each high point. Hence the pen iwill alternately contact with, and recede from the paper, form ing a'dotted or regnlarlyjbroken line. The instrument may be rolled over the paper with great rapidity, allowing the line to be drawn as rapidly as it is possible, with an I ordinary ruling pen,'to draw a continuous line. During this operation the cam disk 8 is inoperative.

p The cylindrical body?) is provided a; slot which extends about half-way around its circumference and, at each end of its I'curved portion, "extends downward. Extendingfradially from the block z' is a pin c. When theproj ection his in engagement "with thefcam ,diskr the pin '0' is in, one of these downwardly extending ends of the slot; By means :of the pin 4 ),v the block/i may ber'aised by hand-and given about half 7 depress the-block and bring the is rolled overthe paper, the block 2' and'the Thereby there is :formed on'the a turn on its axis, the pin moving throughout the curved. partjof the slot 14 until it reaches theopposite downwardly extending 7 end of theslot, the spring t thenactingto projection linerwith the cam disk 8. I With this adjustment, if the" instrument pen 'arennot acted upon throughout the V greater part of the-rotation of the cam disk 8,

butduring-the relatively short remainder of its rotation the block and pen are raised and lowered twice! in quick: succession.

paper a series of alte'rnatelong and short lines. r

,; 5 It is obvious thatthe cam disks r and smay beshaped toactuat'e the block i'in any man-' ner desired, whereby the penwill be caused to form a line of anydesired character.

Bracket 0 carries a stationary guide finger w, by which the pen may be directed or led along an edge, as indicated in Fig. 1. V V

I prefer to make the block 11 in two parts which are adjustable relatively to one another to shorten or lengthen the block. To

this end the upper portion of the blockis 1 provided with a depending threaded neck- 'm which engages a threaded'socket :in the:

lower portion of the block. If the points or the pen wear away, the two portions ofthe block may-be turned on their axes relatively I to one another to shorten the block 'corre: spondingly; In, this way the points of the. pen may be maintained always on a level with the periphery of the wheel '10, except when lifted by one of the cam disks p 7 The f 1 pm 11 "1s sciew-threztdedinthe block and en'- gages the neck 00, thereby holding 'the two parts of the-block from accidentally turning,

relatively to one another.

Having now fully d rib d-m i ib i what I claim 'and desire toprotect by Letters Patent is: r

1. A'draftsmans instrument comprising a. 7

holder, apen, a plurality of camso'per'able in the movement" of the instrument over a dI'LWlIlg surface, a block movable. longitu-g dinally of the holder; and connected with the pen, and 'means to turn the'block to I:

bring it into operative relation with one or the other'ofth'e cams.

i A dnaftsmans instrument comprising a the, Wheel, a pen land t blo'ck slidabl andldo-wn in the: holder and so connected wlth. the-pen "as to impart itsi .mov ement I i thereto, said block being itu'rnable to Ilbrinp; 1t into operative relation other of the 'carndisks o v ,7

A draftsmans instrument com ri ing-a with one} for the holder having a' head, a? block slidablein 2;

said head, apen slid'able on the "holder and connectedwlth therrblocklto -rnov'ejup 1 7 downtherewith, said head provided with a V slotextending part wayarouildit and down ward at each vend o-it-its curved portion, a

p dby the blocklandmovableiin the I slot, a spring yieldinglyfpressing the block downward and ity. msOPrabIe.

in the movement of'theinstrumentj ove drawing surface, saidi'block .being'in op.-., l.

erative relation with onemortheother of" f V said cams dependent upon. whichehd f th I 4:- .slotis:engaged'bythe.pin;I; 1

4. A draftsmans instrument"comprising?a ential groove, a pin carriedby the pen and 0 V 10 0" holder, a wheel carried the; holder and 1 ted to con'tact'with the'drawing S111? 7 face, 'r 'ahtyof cam disksiturning, with engaging said groove, and a plurality of cams, operable in the movement of the instrument over a drawing surface, said block being turnable to bring it into operative relation with one or the other of said cams.

5. A draftsmans instrument comprising a holder, a bracket carried by the holder, a

pen slidable in said bracket longitudinally of the holder, a block movable longitudinally of the holder and provided with a circumferential groove, a pin carried by the pen and engaging said groove, a wheel carried bythe holder and adapted to contact with the drawing surface, a plurality of cam disks turning with the wheel, and a cam carried by the block and in operative relation with one or the other of the cam disks, said block being turnable to bring its cam into operative relation with one or the other of the cam disks.

6. A draft-smans instrument comprising a holder and a pen comprising two jaws, the first jaw being carried by the holder and provided with ears, the second jaw pivoted to the first jaw between said ears and slitted to form spring fingers adapted to engage said ears.

7. A draftsmans instrument comprising a holder, a bracket carried by the holder, a pen comprising two jaws, one of said jaws slidable on the bracket, a pin threaded in the slidable jaw and extending through a slot in the bracket, and a head on the pin,

Copies of this patent may be obtained for five cents each, by addressing the said head extending between the jaws, the second jaw being pivoted on the first jaw and adapted, when swung toward the first jaw, to engage said head.

8. A draftsmans instrument comprising a holder, a wheel carried thereby and adapted to roll over a drawing surface, a pen slidable lon 'tudinally on the holder, a block connecte with the pen and slidable longitudinally on the holder, means controlled by said wheel to reciprocate the block longliltudinally of the holder, and means to vary t e length of the block.

9. A draftsmans instrument comprising a holder, a pen comprising two jaws one of which is carried by the holder while the other is pivotally attached to the first jaw, and an adjusting screw the shank of which extends through one jaw and threads in the holder and the head of which is positioned between the two jaws, whereby the distance between the jaws at the working end of the pen may be regulated by adjusting the head of the screw, while, for purposes of cleaning, the pivoted jaw may be swung open without preliminarily manipulating the adjusting screw and when returned to operative position, will automatically assume the position to which it was previously adjusted.

In testimony of which invention I have hereunto set my hand, at Philadelphia, Pa., on this 20th day of July, 1918.

- DEAN O. LEWIS.

"Commissioner of Patents,

Washington, D. 0. 

